Floor surfacing machine



April 26, 1932. J. w; BISHOP FLOOR SURFACING MACHINE 3 Sheets-Sheet Filed Feb.

ATI'GRNEY April 1932. J w, BISHOP 1,855,737

FLOOR SURFACING MACHINE Filed Feb. 11, 1927 3 Sheets-Sheet 2 ATTORN EY April 26, 1932. J. w. BISHOP FLOUR SURFACING MACHINE 3 Sheets-Shet Filed Feb. 11. 1927 INVENT Patented Apr. 26, 1932 UNITED PAT NT: m.

:rosnrn w. BIsrro on-"MUsKEeoN HEIGHTS, MICHIGAN; assrenon TO' 'rnn sienna WICK-BALKE-COLLENDER- COMPANY, or onrcneo; ILLINOIS, A CORPORATION OF DELAWARE rrzooa sonrnornemAoi-nnn Application filed'Tebruary'll', 19272 Serial- No. 167,451.

's a section through the fan In the embodiment of? the inventiom selected? for illustration the: body of; the machine comprises aibox frame 10: openatthe front and bottom and supportedi imits-"movement over the floor by main wheels 12'housed insidethe box and rotatable on atransverse axis in front of the center of gravity; The

frame is strengthened. in. the-plane. OfIthB main wheels by a rib 14 forming a cross brace.

A three point support is completedby the caster wheel 16; mounted on. the. lower: side of a plate 18=projecting b'aclrfromithezrearf of 730 theiframe.

lPhe main parts of the machine are the abrading roll 20 located in front ofther-open front end of the machine ;;the'-exhaustfan=x22 housed inside the framenear' the rear, and

the exhaust passageways associated; with said fan the control column: indicated: as a whole by the reference character 26 and-extending upwardly and rearwardly from. the

rear end of the frame; and" the power. source indicated as an electric motor 28.- The frame is provided with an integral inclined socket 30 for receiving and supporting the control column, and the socket 30 and plate 18 are braced. and strengthened by an integral-rib '32 extending across between them.

T he abmaiing roll Referringnow to Figures -5' and 6,. the abrading roll comprises a; sheet: metal cylinder 34 havingiahead 36'313'621'6112'6111'1. .Each

weight to: counterbalance the: mass of thegripping rods 42 and enlargement: 40;

Each gripping rod 42co1nprises a main knurled portion, asmoothendportio1r46 havingsan. annular. groove to receive a retaining set screw- 48,v and a smooth end portion '50 terminating in a squared head 52;. The helding rods are set. at aslight'angle with: respect to thea'xis of the roll, and a slot is cut at 54 through: the cylinder 34 and"radiallyi into both heads; 86: between the holding rods.

Each; knurled portion is flatted as at. 56 (Fig.7).

To prepare the roll for use, a flexible sheet 58 carrying abrasive material is wrapped around the cylinder 34 and its edgesiare slipped between: the knurled portions of: the holding rods while these are positioned: with their flatted portions 56' facing each other. Byrotatin 'the rodsto thepositi'on shown in Figure theedges of theflexible sheet may now be drawn in snugly and: the roll is ready for use. i

The roll mounting I A transverse shaft 60 is mounted in the frame at the front near the top. Arms 62 pivoted on the shaft 60 extend outward and downward at opposite sides to support bearings at 64for'the ends of the'roll shaft66.

Beyondthe-bearings the arms are continued 3 in the form of extensions 68projecting'forwardly beyond the roll 20. and terminating in bumpers 70 to prevent movement of the roll against a wall or other vertical surface; The arms 62 are interconnected by sleeves 72 integral therewith and extending in to the center of'the machine. At the center these arms are'interconnected by means of short levers 74 and a cross bolt 76 interconnecting the ends of the levers. Thisbolt is threaded into the end. of one lever: and the other lever has a slotted opening to receive the bolt. The boltisreadily accessible so that minor adjustments to keep the shaft- 66 in anydesired supporting the wheels 12 can readily be made at any time.

The roll control Means are provided for lifting the roll out of contact with the floor surface and for holding it resiliently against the floor surface when desired. I have illustrated a control handle 78 shown in Figure 1 in the position for permitting the roll to engage the floor, and rotatable in a clockwise direction through approximately 90 about the hori zontal handle 80 by which the operator moves the machine from place to place. This handle 80 is rigidly mounted in a U-shaped bracket 83 having-a split socket 85 threaded on the upper end'of the main tube 84 and clamped in place by a tightening bolt 87. The transmission from the handle 78 to the pivoted yoke made up of the arms 62 and sleeves 72 comprises a cam sector 81 carried by the handle 7 8 and bearing against the end of the push rod 82, which push rod extends axially down the center of the main tube 84 of the control column. The lower end of the push rod 82 operates the horizontal arm 86 of an intermediate bell crank lever having a downwardly projecting arm 88 connected by a horizontal link 90 with a crank arm 92 integral with one of the sleeves 72. Thus the downward thrust on the rod 82 rotates the bell crank lever 86, 88 and the yoke in a clockwise direction and lifts'the roll off'the floor. When in the position of Fig. 1, it also collar and nut 102 with interengagingirregularities of contour indicated at 104, the nut 102 may be held in adjusted'position and prevented from unscrewing on account of vibration or any other cause.

Eoohaust The open mouth 106 of the exhaust system lies just back of the lower portion of the roll 20 to receive the dust and particles formed by the action of the roll. The passageway tapers rapidly to a connection with an intermediate connecting tube 108 leading to the intake tube 110 of the fan casing. The fan maybe of any approved design. It is illustrated as comprising a rotor 112 supported 011 a shaft 114 mounted in suitable ball bearings in a boss 116 cast on the wall of the frame. The outer end of the shaft carries a pulley 118 by means of which the fan is to be rotated. The tangential outlet 120 is curved upwardly at 122 and enters a connecting ring 124 over which the mouth of the dust bag 126 is held by the retaining device 128. The upper end of the dust bag may be held in place by a coil spring 130 run ning to the top of the control column.

The motor Transverse rails 132 are mountedon top of the frame and held in place by bolts 134 passing through fore and aft slots in the top of the frame. The motor rests on these rails .to the motor. The box l42-is clamped on the main tube 84 by suitable clips 152. At the bottom the tube 84 is fastened in the socket 30' by a U-bolt 154 and also by fastening the box direct to the upper end of the bracket by ordinary bolts.

Transmission The motor shaft carries a pinion 156 connected bya chain 158 to the sprocket 160 for driving the roll 20. Beyond the pinion 156 it also carries a pulley 162 for a belt connection with the pulley 118 to drive the fan. The axis of the motor shaft is in substantiallythe same plane as the shafts 64 and 60 when the wheel is operating. Thus the movement of the abrading roll up out of engagement with the floor has a negligible effect on the tightness of the chain 158. This tightness can be adjusted by longitudinal movement of the motor with very little effect on the tightness of the belt for driving the fan,

since the belt extends almost directly down while the chain extends downward and forward at an angle of about 45.

I have provided shields to cover the transmission comprising a belt shield 164 extending over the top of both the pulley 162 and the pinion 156 and'a side apron 166 fastened to. the belt shield'at 168. Both shields are supported by a bracket 170 and bolt 172.

Without further elaboration, the foregoing will sofully explain the invention that others may, by applying current knowledge, readily adapt the same for use'under various conditions of service. It will, for instance, be obvious that it is not essential that all the elements described be employed in conjunction, as they may advantageously be utilized in various combinations and subcombinations.

What I claim is 1. A floor surfacing machine comprising a box frame, open at the front and bottom; a column extending upwardly and rearwardly from the rear end of said frame; a yoke journaled on a transverse axis in said frame and having arms extending forward and downward; an abrading roll ournaled on a transverse axis on the ends of said arms; an exhaust fan inside said frame near the rear at one side; a collector having a large receiving mouth just behind the lower portion of said roll and leading to said fan; a duct leading out of said fan; a receiving bag suspended below said column and connected to said duct; a handle at the top of said column for moving the entire machine over the floor a second handle at the top of said column; a linkage extending entirely inside said column and frame for raising and lowering said roll by means of said second handle; tension means adjustable at the rear of said frame and acting on said linkage to press said roll toward the floor; a motor on top of said frame and adjustable both transversely and longitudinally thereon; chain and sprocket connections running from said motor downward and forward outside said frame at one side for driving said roll; belt and pulley connections running from said motor downward outside 7 said frame at the same side for. driving said fan; shields carried by said frame for covering said connections; switch means at the top of said column for controlling said motor; conductors from said switch means to said motor; and rigid housing means forming part of said column and enclosing said conductors.

2; A floor surfacing machine comprising a box frame, open at the front and bottom; a column extending upwardly and rearwardly from the rear end of said frame; a yoke j ournaled on a transverse axis in said frame and having arms extending forward and downward; an abrading roll journaled on a transverse axis on the ends of said arms; said yoke having means for relative angular adjustment of its arms about their common axis; a handle at the top of said column for moving the entire machine over the floor; a second handle at the top of said column; a linkage extending entirely inside said column and frame for raising and lowering said roll by means of said second handle; tension means adjustable at the rear of said frame and acting onsaid linkage to press said roll toward the floor; a motor on top of said frame and adjustable both transversely and longitudinally thereon; connections running from said motor downward outside said frame at one side for driving said roll; and a shield carried by said frame for covering said connections.

JOSEPH W. BISHOP. 

